sdwhip
Observer
I've seen trucks and trucks for sale with the 5.7 with 300k+ miles on them and by the look of some of them they were not easy miles. As long as you find one that hasn't been neglected and you take care of it, the engine on either truck should make it as long as you own the truck. Also other than some odd circumstance either transmission should last past 200k if not as long as the engine is still going. If your not brand loyal buy whichever you find the best deal on. My vote is still Dodge though.